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Message-ID: <CAOMGZ=Gi3g_ALFRv-WiDaRT0pR5EN04OUzCtLX8mARp3_Gwv5A@mail.gmail.com>
Date:   Tue, 6 Dec 2016 09:42:05 +0100
From:   Vegard Nossum <vegard.nossum@...il.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Jones <davej@...emonkey.org.uk>, Chris Mason <clm@...com>,
        Jens Axboe <axboe@...com>,
        Andy Lutomirski <luto@...capital.net>,
        Andy Lutomirski <luto@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>, Josef Bacik <jbacik@...com>,
        David Sterba <dsterba@...e.com>,
        linux-btrfs <linux-btrfs@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Dave Chinner <david@...morbit.com>
Subject: Re: bio linked list corruption.

On 5 December 2016 at 22:33, Vegard Nossum <vegard.nossum@...il.com> wrote:
> On 5 December 2016 at 21:35, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>> Note for Ingo and Peter: this patch has not been tested at all. But
>> Vegard did test an earlier patch of mine that just verified that yes,
>> the issue really was that wait queue entries remained on the wait
>> queue head just as we were about to return and free it.
>
> The second patch has been running for 1h+ without any problems of any
> kind. I should typically have seen 2 crashes by now. I'll let it run
> overnight to be sure.

Alright, so nearly 12 hours later I don't see either the new warning
or the original crash at all, so feel free to add:

Tested-by: Vegard Nossum <vegard.nossum@...cle.com>.

That said, my 8 VMs had all panicked in some way due to OOMs (which is
new since v4.8), although some got page allocation stalls for >20s and
died because "khugepaged blocked for more than 120 seconds", others
got "Out of memory and no killable processes".


Vegard

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